Interestingly, I've update the Killer Bluetooth drivers from the ones recommended on the Dell support site to the latest ones from the Bluetooth adaptor manufacture.

Although the event I mentioned in my OP still occurs, I've not had a single failure with the Bluetooth adaptor today. Fingers crossed!

Just happened again, so clearly not fixed :Angry:

Had the same problem. Drove me nuts.

Dont use the Killer driver. Download this driver from intel

https://downloadcenter.intel.com/download/28267/Intel-Wireless-Bluetooth-for-Windows-10

It worked for me. No more cutting out. The Killer card in your machine is made by Intel (9260)

Thanks, I will give them a go.

Just received Alienware M17 R5 new, Found that the Windows 10 and edge browser amidst other settings were out of date and needed to be configured, I love the laptop but tasks do not seem to be as easy and straight forward as what I had experienced with Windows vista, Windows 7 and Windows 8,   I am experiencing the same issues with the Blue Tooth Connection.  It shows Blue tooth under devices and states to turn it on, but the toggle button  is missing. I checked airplane mode and it does not show there, I looked under view in device sound directory under control panel and do not find bluetooth,  Clearly, this is a common problem. My device is showing USB and Code 28 unknown unsupported devices. I most likely will have to go through the same steps as the User who wrote the initial commentary - report.

Please run Intel Driver & Support Assistant to automatically identify your products and get driver and software updates.